A new study shows the bird flu has silently spread from animals to some veterinarians. It echoes two smaller studies that detected evidence of infection in previously undiagnosed farmworkers.

Three veterinarians specializing in cattle tested positive, according to the study published in the Morbidity and Mortality Weekly Report Thursday. The vets said they never experienced any flu-like symptoms.

State officials said the virus was found in a backyard flock, Monroe County's first case since flu was first detected in Michigan.

Americans may be walking around with bird flu − and not even know it. President Donald Trump's next round of tariffs are expected to be equivalent to the fees that individual countries put on products imported from the U.

Bird flu infections were detected among veterinarians tested last fall, including two people with no known exposure to animals with the virus, according to a report released by the U.S. Centers for Disease Control and Prevention on Thursday.

CDC finds H5 bird flu antibodies in 3 veterinary practitioners, highlighting need for enhanced surveillance and safety protocols.

The new study is more evidence that the official U.S. tally of confirmed human bird flu infections—68 in the past year—is likely a significant undercount.